15 A previously healthy, 27-year-old agricultural worker develops nausea, vomiting, abdominal cramps, cough withwheezing and dyspnea,...

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15 A previously healthy, 27-year-old agricultural worker develops nausea, vomiting, abdominal cramps, cough withwheezing and dyspnea, salivation, and lacrimation 1 hour after leaving work in a field. On examination, he is afebrile with a heart rate of 50/min and blood pressure of 90/55 mm Hg. Laboratory studies show plasma cholinesterase activity less than 50% of normal. Atropine is given intravenously, and his condition improves. He was most likely exposed to which of the following substances? □ (A) Aflatoxin □ (B) Cyclodiene □ (C) Dioxin (D) Ergot alkaloid □ (E) Organophosphate (F) Pyrethrin 15 A previously healthy, 27-year-old agricultural worker develops nausea, vomiting, abdominal cramps, cough withwheezing and dyspnea, salivation, and lacrimation 1 hour after leaving work in a field. On examination, he is afebrile with a heart rate of 50/min and blood pressure of 90/55 mm Hg. Laboratory studies show plasma cholinesterase activity less than 50% of normal. Atropine is given intravenously, and his condition improves. He was most likely exposed to which of the following substances? □ (A) Aflatoxin □ (B) Cyclodiene □ (C) Dioxin (D) Ergot alkaloid □ (E) Organophosphate (F) Pyrethrin